I have no doubt ______ he will overcome all his difficulties.

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问题 I have no doubt ______ he will overcome all his difficulties.

选项 A、whether
B、when
C、that
D、if

答案C

解析 that作从属连词,无实在意义,可用宋引导同位语从句,同时要注意:如果doubt用在否定句中,与其相关的名词性从句要用that而不能用whether或if引导,如:There is no doubt that the whole story was invented.毫无疑问整篇故事全是虚构的。I don’t doubt that John will come on time.约翰会准时来,对这一点我毫不怀疑。如果doubt用在肯定句中,与其相关的名词性从句一般要用whether或if而不能用that引导
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